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CHAPTER IV RESEARCH METHODOLOGY
4.1. Research Metodology
Research methodology is the process to collect information and data about the topic through surveys, questionnaires, interviews, practice to the laboratory
research and so on to get the result that needed. The type of this method is research. The objective of this research is to know
the compressive strength and modulus of elasticity of geopolymer concrete with metakaolin and silica fume. The first step is make the activator. The way to make
the activator is mixed NaOH 0.03 with 1000ml of water and wait for 24 hours. After that, the NaOH 12 M will be mixed with Na
2
SiO
3.
Pasta geopolymer is done. Metakaolin, silica fume and aggregate are mixed together in a big place.
After all, the pasta geopolymer will be pour into the big place that already filled by the aggregate, metakaolin and silica fume. After mix all of the materials and
alkali activator, the geopolymer pasta will be ready to put into the mold. There are two tests that will be used to test the geopolymer concrete. First, test
the compressive strength of the specimen. There will be 9 samples to test the compressive strength in 14 days in small cylinder. Second, test the modulus
elasticity and the compressive strength of the 9 big cylinders. The size of the
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small cylinder will be 70 x 140 mm and the size of the big cylinder will be 150 x 300 mm.
4.2. Specification of Specimen
There are 2 types of test; 1 Compressive strength and 2 modulus of elasticity. The material variable that will be change is metakaolin; 25 of the
total weight of concrete, 50 of the total weight of concrete and 75 of the total weight of concrete while the variable of silica fume will be constant; 5. In the
previous research from Lisantono and Hatmoko 2012 the proportion of the metakaolin is 50
and the result of the concrete with metakaolin is highest compared with the baggase ash and baggase ash + metakaolin. But, the value still
lower than the value of Portland cement. In this research, the writer uses 25 and 75 for the proportion because the writer wants to check that the highest
value of compressive strength based on metakaolin is in fewer than 50 or more than 50. The writer also check the value in 50 to know whether the value of
geopolymer in 50 with silica fume is higher or not compare with the geopolymer concrete based on metakaolin only.
4.3. Research Framework
The purpose of the research framework is to list the research to be more systematic and efficient. The flow chart of the research can be seen in Figure 4.1.
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Figure 4.1 Flowchart of Research Framework
4.4. Materials
There are some materials to make the samples such as fine aggregate, coarse aggregate, aquades, metakaolin, silica fume, NaOH and Na
2
SiO
3
. There is the specification of each material:
1. Fine aggregate such as sand from Kali Progo, Sleman, Yogyakarta. The
fine aggregate can be seen in Figure 4.2.
Figure 4.2 Fine Aggregate
Start Prepare the
Materials Check the
materials
Design the mixture of the speciment
Make the speciments
Concrete treatment
Compressive Strength and
Modulus Elasticity Data Analysis
Conclusion
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